I use to lose about 6-8 pounds of water weight per game playing football in high school, so the endurance argument is moot. Its a different type of endurance, where football is more anaerobic and soccer is more aerobic. Football is a tough sport to play well, but I have all the respect in the world for soccer players, because it takes so much endurance to play a whole game as they do. Plus, I used to know some of the women soccer players at my alma mater and those gals were tough as nails--some of them you've seen on TV. Anyway, two very different sports. The biggest problem I have in the States is that in high school, both are fall sports. So, some of the best athletes in the school have to pick one or the other and can't participate in both. In my opinion, that's the biggest impediment to soccer gaining acceptance here. If you moved men's high school soccer to the spring, I think the argument about which one was tougher would be diminished.